Android Question Not able to open downloaded pdf file in Starter.Provider.SharedFolder

Sub JobDone (Job As HttpJob)
   Log("JobName = " & Job.JobName & ", Success = " & Job.Success)
   If Job.Success = True Then
       Select Job.JobName
           Case "Job1"
               customPdfFilenameToSave = "abcd.pdf"

               Dim OutStream As OutputStream
               OutStream = File.OpenOutput(FindUserDownloadsFolder, customPdfFilenameToSave, False)
                                              
               File.Copy2(Job.GetInputStream,OutStream)
               OutStream.Close
              
               OpenPDF2(File.Combine(FindUserDownloadsFolder, customPdfFilenameToSave))
       End Select
   Else
       Log("Error: " & Job.ErrorMessage)
   End If
   Job.Release
End Sub
              
Sub OpenPDF2(FileName As String)
   Dim in As Intent
   in.Initialize(in.ACTION_VIEW, "")
   Starter.Provider.SetFileUriAsIntentData(in, FileName)
   'Type must be set after calling SetFileUriAsIntentData
   in.SetType("application/pdf")
   StartActivity(in)
End Sub

Sub FindUserDownloadsFolder As String
       Return Starter.rp.GetSafeDirDefaultExternal("shared")
       'Return Starter.Provider.SharedFolder
End Sub